Changelog

Enhancement

Add telemetry for Java properties. pull 26038
Update Winstone to version 8.1026.v31def012a_f48 to increase the default maximum HTTP response header size to 32KB to account for very complex Content Security Policy headers. pull 25901
Allow entirely disabling CSP headers to work around unusual Jenkins configurations resulting in excessive HTTP response header lengths. pull 23915
Add telemetry for Content Security Policy enforcement. pull 23901
Add Windows Server 2022 for Windows controller and agent containers. pull 2209 (Docker), pull 441 (Docker agents)
Add Java 25 container images for the Jenkins controller and agents. pull 2146 (Docker), pull 549 (Docker SSH agent), pull 1061 (Docker agents)

Bug fix

Use rootURL in Cloud sidepanel so links in actions work properly. pull 26004
Fix console log copy button for freestyle projects that have finished (regression in 2.493). pull 25953
Allow large forms to be submitted (regression in 2.531). pull 25968

Major enhancement

Support Java 25. pull 11148
Allow configuring Content-Security-Policy protection for the Jenkins UI. Introduce an API for plugins to relax (or further tighten) the rules around various resources. If you have the Content Security Policy Plugin (csp) installed, update it to version 2.x. admin documentation, plugin compatibility, developer documentation, JENKINS-76263
Red Hat and openSUSE packages are unified into the same RPM packaging with a brand new URL: https://pkg.jenkins.io/rpm-stable/. We kept the former LTS packages (versions 2.528.3 and below) in https://pkg.jenkins.io/redhat-stable-legacy/. Red Hat and openSUSE users are redirected from older endpoints (/redhat-stable and /opensuse-stable) to "https://pkg.jenkins.io/rpm-stable/" but are strongly advised to update their "jenkins.repo" repository configurations. System V initialization scripts are removed for openSUSE installations pull 430 (packaging), Linux install packages migrated from System V init to systemd

Enhancement

Move the user time zone configuration to the user preferences page. pull 11065
Remove duplicate built-in executor configuration from System configuration page. It now configures it on the built-in executor under Nodes instead. pull 11224
Add ability to set default value for experimental flags via system property. JENKINS-76260
Redesign the reorderable list component. pull 10186
Log a thread dump when a /health check exceeds the 10 second default timeout to help diagnose stuck requests. This timeout is configurable via the jenkins.health.HealthCheckAction.thresholdTimeout system property. pull 11266
Use the same styling for title bar mouseover effect. JENKINS-75990
Add rest API to create an agent from XML. pull 11229
Add experimental pages for Manage Jenkins, jobs, builds, dashboard, run details, and parameter details. pull 11194, pull 11208, pull 11222, pull 11116, pull 11127, pull 11128

Bug fix

Eliminate spurious CPU utilization in browser when idle. pull 11257
Fix toggle collapse in Chrome to prevent 404 errors. JENKINS-76118
Fix MyViewsProperty condition. pull 11252
Set the default enter delay for tooltips to 250ms. JENKINS-75892
Restore file fingerprint and project relationship actions to views. JENKINS-76275
Fix API token rendering. pull 11321

Changelog for 2.541.1